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Assessing the impact of the atmoshpheric nutrient inputs to the ocean on the ocean biogeochemical cycles

Research Project

Project/Area Number 20K12144
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

Yamamoto Akitomo  国立研究開発法人海洋研究開発機構, 地球環境部門(環境変動予測研究センター), 特任研究員 (30794680)

Co-Investigator(Kenkyū-buntansha) 羽島 知洋  国立研究開発法人海洋研究開発機構, 地球環境部門(環境変動予測研究センター), グループリーダー代理 (40533211)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords海洋生物地球化学循環 / 富栄養化 / 気候変動 / 地球システムモデル / 海洋基礎生産 / 貧酸素化 / 海洋炭素循環 / 海洋生態系 / 大気沈着 / 基礎生産 / 炭素循環 / 地球温暖化 / 人為起源エアロゾル
Outline of Research at the Start

地球温暖化は海洋の成層化により海洋深層から表層への栄養塩供給を減少させる一方、人為起源エアロゾルは大気から海洋への栄養塩供給量を倍増させている。そのため海洋の基礎生産は温暖化と海洋外からの栄養塩流入という2つの人為的プロセスの影響を受ける。しかし、従来の地球温暖化研究では、人為起源エアロゾルからの栄養塩供給が考慮されていなかった。本研究では大気由来の栄養塩沈着過程を組み込んだ地球システムモデルを用いた数値実験を実施し、地球温暖化の影響と人為起源エアロゾルの影響をそれぞれ定量化するとともに両影響の相互関係を明らかにする。さらには基礎生産の変化に付随して生じる炭素循環や貧酸素化への影響も評価する。

Outline of Final Research Achievements

We demonstrated that the contribution of anthropogenic nutrient inputs to past global changes in ocean biogeochemistry is of similar magnitude to the effect of climate change using historical simulations by an Earth system model. Anthropogenic nutrient inputs increase oceanic productivity and carbon uptake, offsetting climate-induced decrease and accelerating climate-driven deoxygenation in the upper ocean. Considering the effects of both nutrient inputs and climate change is crucial in assessing anthropogenic impacts on ocean biogeochemistry. These results were published in the Science Advances.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた結果は、人間活動が複数の影響を通じて全球的な海洋環境の変動に影響を与えている可能性を初めて指摘した。同時に、人間活動が海洋環境に及ぼす負荷を低減するためには、従来知られている気候変動(人為的な炭素排出)だけではなく、富栄養化(人為的な窒素などの排出)についても配慮する必要性を示している。得られた結果はインパクトファクターの高いScience Advancesにて発表され、学術的にも意義の高い結果であると認識されている。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (12 results)

All 2024 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (9 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model2024

    • Author(s)
      Yoshikawa Chisato、Shigemitsu Masahito、Yamamoto Akitomo、Oka Akira、Ohkouchi Naohiko
    • Journal Title

      Frontiers in Marine Science

      Volume: 11 Pages: 1294608-1294608

    • DOI

      10.3389/fmars.2024.1294608

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Irreversible loss in marine ecosystem habitability after a temperature overshoot2023

    • Author(s)
      Santana-Falcon Yeray、Yamamoto Akitomo、Lenton Andrew、Jones Chris D.、Burger Friedrich A.、John Jasmin G.、Tjiputra Jerry、Schwinger Jorg、Kawamiya Michio、Frolicher Thomas L.、Ziehn Tilo、Seferian Roland
    • Journal Title

      Communications Earth & Environment

      Volume: 4 Issue: 1

    • DOI

      10.1038/s43247-023-01002-1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Competing and accelerating effects of anthropogenic nutrient inputs on climate-driven changes in ocean carbon and oxygen cycles2022

    • Author(s)
      Yamamoto Akitomo、Hajima Tomohiro、Yamazaki Dai、Noguchi Aita Maki、Ito Akinori、Kawamiya Michio
    • Journal Title

      Science Advances

      Volume: 8 Issue: 26

    • DOI

      10.1126/sciadv.abl9207

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 大気及び河川を介した富栄養化に対する海洋炭素、酸素循環の応答2023

    • Author(s)
      山本 彬友、羽島 知洋、山崎 大、野口 真希、伊藤 彰記、河宮 未知生
    • Organizer
      JpGU Union Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 地球システムモデルMIROC-ES2Lの現状と今後の展望2023

    • Author(s)
      山本彬友, 渡辺路生, 野口真希, 増田良帆, 羽島知洋, 建部洋晶, 河宮未知生
    • Organizer
      海洋学会2023秋季大会 熱帯分野横断シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 人間活動に伴う富栄養化が全球海洋生態系、物質循環に与える影響: 地球システムモデルを用 いた評価2023

    • Author(s)
      山本彬友
    • Organizer
      2023年度 水圏生態系モデリングシンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] Response of the ocean carbon and oxygen cycles to climate change and anthropogenic nutrient inputs2023

    • Author(s)
      Akitomo Yamamoto, Tomohiro Hajima, Dai Yamazaki, Maki Noguchi-Aita, Akinori Ito, and Michio Kawamiya
    • Organizer
      EGU General Assembly 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Response of deep ocean circulation and dissolved oxygen to climate change on millennial time-scales2023

    • Author(s)
      Akitomo Yamamoto, Tomohiro Hajima, Manabu Abe, Tokuta Yokohata, Ayako Abe-Ouchi, Michio Kawamiya
    • Organizer
      JpGU Union Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Impacts of climate change and anthropogenic inputs of nitrogen and iron on the ocean carbon and oxygen cycles2023

    • Author(s)
      Akitomo Yamamoto, Tomohiro Hajima, Dai Yamazaki, Maki Noguchi, Akinori Ito and Michio Kawamiya
    • Organizer
      Ocean Science Meeting 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Competing and accelerating effects of anthropogenic nutrient inputs on climate-driven changes in ocean carbon and oxygen cycles2022

    • Author(s)
      Yamamoto Akitomo、Hajima Tomohiro、Yamazaki Dai、Noguchi Aita Maki、Ito Akinori、Kawamiya Michio
    • Organizer
      Japan Geoscience Union Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 大気及び河川を通じた人為起源栄養塩の流入が全球の炭素及び酸素 循環に与える影響2022

    • Author(s)
      山本彬友、羽島知洋、山崎大、野口真希、伊藤彰記、河宮未知生
    • Organizer
      日本海洋学会2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] The response of ocean biogeochemical cycles to global warming and anthropogenic nutrient inputs from atmosphere and rivers2021

    • Author(s)
      Akitomo Yamamoto, Tomohiro Hajima, Dai Yamazaki, Maki Noguchi Aita, Michio Kawamiya
    • Organizer
      JpGU 2021
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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